50lbs is quite an achievement, already. Let me translate that into metrics, which I am far more familiar with: 23 kg! You could go further, if you wanted to, but 170 cm and 74 kg is within the normal range. Don’t move too fast, that might have detrimental side effects, too.

By the way, thanks for following my blog. You’re somewhat a-typical for someone reading my posts, judging by what I’ve seen so far, but I am the embodiment of a-typical 🙂